code: def idf1(result_dict):
      num = idtp(result_dict)
      denum = num_objects(result_dict) + num_pred(result_dict)
      return 2 * num / denum
  
file_path: gluon-cv/scripts/tracking/smot/helper.py
imports: import motmetrics
  import numpy
  import os
  import sys
label_desc: Use image node_id 5 for calling a global function with example usage: idf1(result_dict) and returns: unknown